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2. Metallic bonding - Wikipedia

   en.wikipedia.org/wiki/Metallic_bonding

   Metals are insoluble in water or organic solvents, unless they undergo a reaction with them. Typically, this is an oxidation reaction that robs the metal atoms of their itinerant electrons, destroying the metallic bonding. However metals are often readily soluble in each other while retaining the metallic character of their bonding.

3. Chemical impurity - Wikipedia

   en.wikipedia.org/wiki/Chemical_impurity

   Impurities can become unwanted when they prevent the working nature of the material. Examples include ash and debris in metals and leaf pieces in blank white papers. The removal of impurities is usually done chemically. For example, in the manufacturing of iron, calcium carbonate is added to the blast furnaces to remove silicon dioxide from the ...

4. MXenes - Wikipedia

   en.wikipedia.org/wiki/MXenes

   MXenes adopt three structures with one metal on the M site, as inherited from the parent MAX phases: M 2 C, M 3 C 2, and M 4 C 3.They are produced by selectively etching out the A element from a MAX phase or other layered precursor (e.g., Mo 2 Ga 2 C), which has the general formula M n+1 AX n, where M is an early transition metal, A is an element from group 13 or 14 of the periodic table, X is ...

5. Properties of metals, metalloids and nonmetals - Wikipedia

   en.wikipedia.org/wiki/Properties_of_metals...

   The chemical elements can be broadly divided into metals, metalloids, and nonmetals according to their shared physical and chemical properties.All elemental metals have a shiny appearance (at least when freshly polished); are good conductors of heat and electricity; form alloys with other metallic elements; and have at least one basic oxide.

6. Vapor etching - Wikipedia

   en.wikipedia.org/wiki/Vapor_etching

   Vapor etching refers to a process used in the fabrication of Microelectromechanical systems (MEMS) and Nanoelectromechanical systems (NEMS). Sacrificial layers are isotropically etched using gaseous acids such as Hydrogen fluoride and Xenon difluoride to release the free standing components of the device.

7. Hardnesses of the elements (data page) - Wikipedia

   en.wikipedia.org/wiki/Hardnesses_of_the_elements...

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8. Are Red Moles on Skin Dangerous? Here’s What Derms Have to Say

   www.aol.com/lifestyle/red-moles-skin-dangerous...

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9. Periodic table (crystal structure) - Wikipedia

   en.wikipedia.org/wiki/Periodic_table_(crystal...

   However, in real materials there are deviations from this in some metals where the unit cell is distorted in one direction but the structure still retains the hcp space group—remarkable all the elements have a ratio of lattice parameters c/a < 1.633 (best are Mg and Co and worst Be with c/a ~ 1.568).